diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h b/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
index e6aa0f334..9a012c176 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorForwardDeclarations.h
@@ -27,7 +27,7 @@ namespace TensorSycl {
 namespace internal{
 template <typename HostExpr, typename FunctorExpr, typename Tuple_of_Acc, typename Dims, typename Op, typename Index> class ReductionFunctor;
 template<typename CoeffReturnType ,typename OutAccessor, typename HostExpr, typename FunctorExpr, typename Op, typename Dims, typename Index, typename TupleType>
-struct FullReductionKernelFunctor;
+class FullReductionKernelFunctor;
 }
 }
 #endif
diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorSyclFunctors.h b/unsupported/Eigen/CXX11/src/Tensor/TensorSyclFunctors.h
index 85c280588..710e22474 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorSyclFunctors.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorSyclFunctors.h
@@ -101,7 +101,8 @@ template < typename HostExpr, typename FunctorExpr, typename Tuple_of_Acc, typen
 
 
 template<typename CoeffReturnType ,typename OutAccessor, typename HostExpr, typename FunctorExpr, typename Op, typename Dims, typename Index, typename TupleType>
-struct FullReductionKernelFunctor{
+class FullReductionKernelFunctor{
+public:
   typedef  typename TensorSycl::internal::createPlaceHolderExpression<HostExpr>::Type PlaceHolderExpr;
   OutAccessor tmp_global_accessor;
   Index rng , remaining, red_factor;